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Semiquantum Key Distribution Using Entangled States |
| WANG Jian, ZHANG Sheng, ZHANG Quan, TANG Chao-Jing
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| School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073 |
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| Cite this article: |
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WANG Jian, ZHANG Sheng, ZHANG Quan et al 2011 Chin. Phys. Lett. 28 100301 |
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Abstract Recently, Boyer et al. presented a novel semiquantum key distribution protocol [Phys. Rev. Lett. 99 (2007) 140501] by using four quantum states, each of which is randomly prepared in the Z or X basis. Here we present a semiquantum key distribution protocol by using maximally entangled states in which quantum Alice shares a secret key with classical Bob. Quantum Alice has the ability to prepare Bell states and perform Bell basis or computational basis measurement. Classical Bob is restricted to measuring, preparing a particle in the computational basis, reflecting or reordering the particles. The qubit efficiency of the protocol improves to 50% and the protocol can be modified to a measure-resend protocol or a protocol without quantum memory. We also show that the protocol is secure against eavesdropping.
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| Keywords:
03.67.Dd
03.67.Hk
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Received: 21 June 2011
Published: 28 September 2011
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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